package cn.ymatrix.countryAlgorithm.Util;

import java.math.BigInteger;

public class Util {
  /**
   * 整形转换成网络传输的字节流（字节数组）型数据
   *
   * @param num 一个整型数据
   * @return 4个字节的自己数组
   */
  public static byte[] intToBytes(int num) {
    byte[] bytes = new byte[4];
    bytes[0] = (byte) (0xff & (num >> 0));
    bytes[1] = (byte) (0xff & (num >> 8));
    bytes[2] = (byte) (0xff & (num >> 16));
    bytes[3] = (byte) (0xff & (num >> 24));
    return bytes;
  }

  /**
   * 四个字节的字节数据转换成一个整形数据
   *
   * @param bytes 4个字节的字节数组
   * @return 一个整型数据
   */
  public static int byteToInt(byte[] bytes) {
    int num = 0;
    int temp;
    temp = (0x000000ff & (bytes[0])) << 0;
    num = num | temp;
    temp = (0x000000ff & (bytes[1])) << 8;
    num = num | temp;
    temp = (0x000000ff & (bytes[2])) << 16;
    num = num | temp;
    temp = (0x000000ff & (bytes[3])) << 24;
    num = num | temp;
    return num;
  }

  /**
   * 长整形转换成网络传输的字节流（字节数组）型数据
   *
   * @param num 一个长整型数据
   * @return 4个字节的自己数组
   */
  public static byte[] longToBytes(long num) {
    byte[] bytes = new byte[8];
    for (int i = 0; i < 8; i++) {
      bytes[i] = (byte) (0xff & (num >> (i * 8)));
    }

    return bytes;
  }

  /**
   * 大数字转换字节流（字节数组）型数据
   *
   * @param n
   * @return
   */
  public static byte[] byteConvert32Bytes(BigInteger n) {
    byte[] tmpd = null;
    if (n == null) {
      return null;
    }

    if (n.toByteArray().length == 33) {
      tmpd = new byte[32];
      System.arraycopy(n.toByteArray(), 1, tmpd, 0, 32);
    } else if (n.toByteArray().length == 32) {
      tmpd = n.toByteArray();
    } else {
      tmpd = new byte[32];
      for (int i = 0; i < 32 - n.toByteArray().length; i++) {
        tmpd[i] = 0;
      }
      System.arraycopy(
          n.toByteArray(), 0, tmpd, 32 - n.toByteArray().length, n.toByteArray().length);
    }
    return tmpd;
  }

  /**
   * 换字节流（字节数组）型数据转大数字
   *
   * @param b
   * @return
   */
  public static BigInteger byteConvertInteger(byte[] b) {
    if (b[0] < 0) {
      byte[] temp = new byte[b.length + 1];
      temp[0] = 0;
      System.arraycopy(b, 0, temp, 1, b.length);
      return new BigInteger(temp);
    }
    return new BigInteger(b);
  }

  /**
   * 根据字节数组获得值(十六进制数字)
   *
   * @param bytes
   * @return
   */
  public static String getHexString(byte[] bytes) {
    return getHexString(bytes, true);
  }

  /**
   * 根据字节数组获得值(十六进制数字)
   *
   * @param bytes
   * @param upperCase
   * @return
   */
  public static String getHexString(byte[] bytes, boolean upperCase) {
    String ret = "";
    for (int i = 0; i < bytes.length; i++) {
      ret += Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1);
    }
    return upperCase ? ret.toUpperCase() : ret;
  }

  /**
   * 打印十六进制字符串
   *
   * @param bytes
   */
  public static void printHexString(byte[] bytes) {
    for (int i = 0; i < bytes.length; i++) {
      String hex = Integer.toHexString(bytes[i] & 0xFF);
      if (hex.length() == 1) {
        hex = '0' + hex;
      }
      System.out.print("0x" + hex.toUpperCase() + ",");
    }
    System.out.println();
  }

  /**
   * Convert hex string to byte[]
   *
   * @param hexString the hex string
   * @return byte[]
   */
  public static byte[] hexStringToBytes(String hexString) {
    if (hexString == null || hexString.equals("")) {
      return null;
    }

    hexString = hexString.toUpperCase();
    int length = hexString.length() / 2;
    char[] hexChars = hexString.toCharArray();
    byte[] d = new byte[length];
    for (int i = 0; i < length; i++) {
      int pos = i * 2;
      d[i] = (byte) (charToByte(hexChars[pos]) << 4 | charToByte(hexChars[pos + 1]));
    }
    return d;
  }

  /**
   * Convert char to byte
   *
   * @param c char
   * @return byte
   */
  public static byte charToByte(char c) {
    return (byte) "0123456789ABCDEF".indexOf(c);
  }

  /** 用于建立十六进制字符的输出的小写字符数组 */
  private static final char[] DIGITS_LOWER = {
    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
  };

  /** 用于建立十六进制字符的输出的大写字符数组 */
  private static final char[] DIGITS_UPPER = {
    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
  };

  /**
   * 将字节数组转换为十六进制字符数组
   *
   * @param data byte[]
   * @return 十六进制char[]
   */
  public static char[] encodeHex(byte[] data) {
    return encodeHex(data, true);
  }

  /**
   * 将字节数组转换为十六进制字符数组
   *
   * @param data byte[]
   * @param toLowerCase <code>true</code> 传换成小写格式 ， <code>false</code> 传换成大写格式
   * @return 十六进制char[]
   */
  public static char[] encodeHex(byte[] data, boolean toLowerCase) {
    return encodeHex(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
  }

  /**
   * 将字节数组转换为十六进制字符数组
   *
   * @param data byte[]
   * @param toDigits 用于控制输出的char[]
   * @return 十六进制char[]
   */
  protected static char[] encodeHex(byte[] data, char[] toDigits) {
    int l = data.length;
    char[] out = new char[l << 1];
    // two characters form the hex value.
    for (int i = 0, j = 0; i < l; i++) {
      out[j++] = toDigits[(0xF0 & data[i]) >>> 4];
      out[j++] = toDigits[0x0F & data[i]];
    }
    return out;
  }

  /**
   * 将字节数组转换为十六进制字符串
   *
   * @param data byte[]
   * @return 十六进制String
   */
  public static String encodeHexString(byte[] data) {
    return encodeHexString(data, true);
  }

  /**
   * 将字节数组转换为十六进制字符串
   *
   * @param data byte[]
   * @param toLowerCase <code>true</code> 传换成小写格式 ， <code>false</code> 传换成大写格式
   * @return 十六进制String
   */
  public static String encodeHexString(byte[] data, boolean toLowerCase) {
    return encodeHexString(data, toLowerCase ? DIGITS_LOWER : DIGITS_UPPER);
  }

  /**
   * 将字节数组转换为十六进制字符串
   *
   * @param data byte[]
   * @param toDigits 用于控制输出的char[]
   * @return 十六进制String
   */
  protected static String encodeHexString(byte[] data, char[] toDigits) {
    return new String(encodeHex(data, toDigits));
  }

  /**
   * 将十六进制字符数组转换为字节数组
   *
   * @param data 十六进制char[]
   * @return byte[]
   * @throws RuntimeException 如果源十六进制字符数组是一个奇怪的长度，将抛出运行时异常
   */
  public static byte[] decodeHex(char[] data) {
    int len = data.length;

    if ((len & 0x01) != 0) {
      throw new RuntimeException("Odd number of characters.");
    }

    byte[] out = new byte[len >> 1];

    // two characters form the hex value.
    for (int i = 0, j = 0; j < len; i++) {
      int f = toDigit(data[j], j) << 4;
      j++;
      f = f | toDigit(data[j], j);
      j++;
      out[i] = (byte) (f & 0xFF);
    }

    return out;
  }

  /**
   * 将十六进制字符转换成一个整数
   *
   * @param ch 十六进制char
   * @param index 十六进制字符在字符数组中的位置
   * @return 一个整数
   * @throws RuntimeException 当ch不是一个合法的十六进制字符时，抛出运行时异常
   */
  protected static int toDigit(char ch, int index) {
    int digit = Character.digit(ch, 16);
    if (digit == -1) {
      throw new RuntimeException("Illegal hexadecimal character " + ch + " at index " + index);
    }
    return digit;
  }

  /**
   * 数字字符串转ASCII码字符串
   *
   * @param String 字符串
   * @return ASCII字符串
   */
  public static String StringToAsciiString(String content) {
    String result = "";
    int max = content.length();
    for (int i = 0; i < max; i++) {
      char c = content.charAt(i);
      String b = Integer.toHexString(c);
      result = result + b;
    }
    return result;
  }

  /**
   * 十六进制转字符串
   *
   * @param hexString 十六进制字符串
   * @param encodeType 编码类型4：Unicode，2：普通编码
   * @return 字符串
   */
  public static String hexStringToString(String hexString, int encodeType) {
    String result = "";
    int max = hexString.length() / encodeType;
    for (int i = 0; i < max; i++) {
      char c =
          (char) hexStringToAlgorism(hexString.substring(i * encodeType, (i + 1) * encodeType));
      result += c;
    }
    return result;
  }

  /**
   * 十六进制字符串装十进制
   *
   * @param hex 十六进制字符串
   * @return 十进制数值
   */
  public static int hexStringToAlgorism(String hex) {
    hex = hex.toUpperCase();
    int max = hex.length();
    int result = 0;
    for (int i = max; i > 0; i--) {
      char c = hex.charAt(i - 1);
      int algorism = 0;
      if (c >= '0' && c <= '9') {
        algorism = c - '0';
      } else {
        algorism = c - 55;
      }
      result += Math.pow(16, max - i) * algorism;
    }
    return result;
  }

  /**
   * 十六转二进制
   *
   * @param hex 十六进制字符串
   * @return 二进制字符串
   */
  public static String hexStringToBinary(String hex) {
    hex = hex.toUpperCase();
    String result = "";
    int max = hex.length();
    for (int i = 0; i < max; i++) {
      char c = hex.charAt(i);
      switch (c) {
        case '0':
          result += "0000";
          break;
        case '1':
          result += "0001";
          break;
        case '2':
          result += "0010";
          break;
        case '3':
          result += "0011";
          break;
        case '4':
          result += "0100";
          break;
        case '5':
          result += "0101";
          break;
        case '6':
          result += "0110";
          break;
        case '7':
          result += "0111";
          break;
        case '8':
          result += "1000";
          break;
        case '9':
          result += "1001";
          break;
        case 'A':
          result += "1010";
          break;
        case 'B':
          result += "1011";
          break;
        case 'C':
          result += "1100";
          break;
        case 'D':
          result += "1101";
          break;
        case 'E':
          result += "1110";
          break;
        case 'F':
          result += "1111";
          break;
      }
    }
    return result;
  }

  /**
   * ASCII码字符串转数字字符串
   *
   * @param String ASCII字符串
   * @return 字符串
   */
  public static String AsciiStringToString(String content) {
    String result = "";
    int length = content.length() / 2;
    for (int i = 0; i < length; i++) {
      String c = content.substring(i * 2, i * 2 + 2);
      int a = hexStringToAlgorism(c);
      char b = (char) a;
      String d = String.valueOf(b);
      result += d;
    }
    return result;
  }

  /**
   * 将十进制转换为指定长度的十六进制字符串
   *
   * @param algorism int 十进制数字
   * @param maxLength int 转换后的十六进制字符串长度
   * @return String 转换后的十六进制字符串
   */
  public static String algorismToHexString(int algorism, int maxLength) {
    String result = "";
    result = Integer.toHexString(algorism);

    if (result.length() % 2 == 1) {
      result = "0" + result;
    }
    return patchHexString(result.toUpperCase(), maxLength);
  }

  /**
   * 字节数组转为普通字符串（ASCII对应的字符）
   *
   * @param bytearray byte[]
   * @return String
   */
  public static String byteToString(byte[] bytearray) {
    String result = "";
    char temp;

    int length = bytearray.length;
    for (int i = 0; i < length; i++) {
      temp = (char) bytearray[i];
      result += temp;
    }
    return result;
  }

  /**
   * 二进制字符串转十进制
   *
   * @param binary 二进制字符串
   * @return 十进制数值
   */
  public static int binaryToAlgorism(String binary) {
    int max = binary.length();
    int result = 0;
    for (int i = max; i > 0; i--) {
      char c = binary.charAt(i - 1);
      int algorism = c - '0';
      result += Math.pow(2, max - i) * algorism;
    }
    return result;
  }

  /**
   * 十进制转换为十六进制字符串
   *
   * @param algorism int 十进制的数字
   * @return String 对应的十六进制字符串
   */
  public static String algorismToHEXString(int algorism) {
    String result = "";
    result = Integer.toHexString(algorism);

    if (result.length() % 2 == 1) {
      result = "0" + result;
    }
    result = result.toUpperCase();

    return result;
  }

  /**
   * HEX字符串前补0，主要用于长度位数不足。
   *
   * @param str String 需要补充长度的十六进制字符串
   * @param maxLength int 补充后十六进制字符串的长度
   * @return 补充结果
   */
  public static String patchHexString(String str, int maxLength) {
    String temp = "";
    for (int i = 0; i < maxLength - str.length(); i++) {
      temp = "0" + temp;
    }
    str = (temp + str).substring(0, maxLength);
    return str;
  }

  /**
   * 将一个字符串转换为int
   *
   * @param s String 要转换的字符串
   * @param defaultInt int 如果出现异常,默认返回的数字
   * @param radix int 要转换的字符串是什么进制的,如16 8 10.
   * @return int 转换后的数字
   */
  public static int parseToInt(String s, int defaultInt, int radix) {
    int i = 0;
    try {
      i = Integer.parseInt(s, radix);
    } catch (NumberFormatException ex) {
      i = defaultInt;
    }
    return i;
  }

  /**
   * 将一个十进制形式的数字字符串转换为int
   *
   * @param s String 要转换的字符串
   * @param defaultInt int 如果出现异常,默认返回的数字
   * @return int 转换后的数字
   */
  public static int parseToInt(String s, int defaultInt) {
    int i = 0;
    try {
      i = Integer.parseInt(s);
    } catch (NumberFormatException ex) {
      i = defaultInt;
    }
    return i;
  }

  /**
   * 十六进制串转化为byte数组
   *
   * @return the array of byte
   */
  public static byte[] hexToByte(String hex) throws IllegalArgumentException {
    if (hex.length() % 2 != 0) {
      throw new IllegalArgumentException();
    }
    char[] arr = hex.toCharArray();
    byte[] b = new byte[hex.length() / 2];
    for (int i = 0, j = 0, l = hex.length(); i < l; i++, j++) {
      String swap = "" + arr[i++] + arr[i];
      int byteint = Integer.parseInt(swap, 16) & 0xFF;
      b[j] = new Integer(byteint).byteValue();
    }
    return b;
  }

  /**
   * 字节数组转换为十六进制字符串
   *
   * @param b byte[] 需要转换的字节数组
   * @return String 十六进制字符串
   */
  public static String byteToHex(byte[] b) {
    if (b == null) {
      throw new IllegalArgumentException("Argument b ( byte array ) is null! ");
    }
    String hs = "";
    String stmp = "";
    for (int n = 0; n < b.length; n++) {
      stmp = Integer.toHexString(b[n] & 0xff);
      if (stmp.length() == 1) {
        hs = hs + "0" + stmp;
      } else {
        hs = hs + stmp;
      }
    }
    return hs.toUpperCase();
  }

  public static byte[] subByte(byte[] input, int startIndex, int length) {
    byte[] bt = new byte[length];
    System.arraycopy(input, startIndex, bt, 0, length);
    return bt;
  }
}
